Erwin lavens and james c



A waited gime @anni @wie Leners Patent No. 102,136, ma Apen 19, 1870.

IMPROVEMENT IN ROTARY 'PUMPS The Schedule referred to in these LettersPatent and making part of the same.

To all whom it may concern Be it' known that we, ERWIN LAvnNs and J AMESC. LAMB, of Middletown, in they county of Middlesex and in the State ofConnecticut, have invented certain new and useful improvements in RotaryPumps; and do hereby declare that the following is a full, clear, andexact description thereof, reference being had to the accompanyingdrawings and to the letters ofreference marked thereon rua-king a partof this specification. v Y

The. uatxu'e of our invention consists in the coustruction audarrangement of a rotary pumpffas will be more fully hereinafterdescribed.

In order to enable others skilled iu the art to which our inventionappertans to make -and use the same, we

will now proceed to describe its construction and operation, referringto theanuexed drawings,l in which- Figure 1 is a longitudinal verticalsect-ion, and Figure 2, a transverse vertical section of our pump. Arepresents the outside cylinder, provided with a channel, B, along oneside on the outside, an aperture, a, leading from the upper end of' saidchannel into the outer cylinder.`

At thelower end ofthe channel B, the supply-pipe C is secured, so thatthe water is drawn np through said pipe into the channel B, and throughthe aperture d into the outer cylinder A.

On a shaft, D, passing through the end pieces of' the cylinder, issecured an inner cylinder, E, of oval' shape.

On the outside cylinder A is formed a. recess or This roller is placedabout twenty degrees from a l perpendicular line through the center ofthe cylinders.

lhe pressure of this roller is divided between the lower side of thechamber G and the surface of the inside cylinder- E, and this cylinder,being, as de'- scribed, of an ovalfshape, when rotated, produces avacuum on one side of the abutment-roller H, and dis- -.charges ou theother through the discharge-pipe I.

The inside cylinder E is oval in shape, viewing it endwise; but it isnot a true oval, the longest diameter being fitted to the inside of theoutside cylinder, and for'a short space isof the same circle. Therefore,

We do not wish to coutne ourselves to any exact shape of the insidecylinder, or to any exact shape or position of the chamber containingthe roller H; but

That we claim as new, and desire to secure by Let ters Patent, is

The arrangement of the supply-pipe C, cylinder A, with channel B,-aperture a, egg-shaped cylinde'i` E, upon the cross shaft D, box G,with removable cover, roller H, and outlet-pipe I, all constructed tooperate substantially as set forth.

In testimony that vwe claim the foregoing, we have hereunto set ourhands and seals this 10th day of February, 1870. ERWIN LA'VENS. [L. S.]JAMES C. LAMB. [1.. s.]

g Witnesses:

Neiman L. BRAINERD, Astr HYDE.

